Since the release of iPhone 4 and the iPad 3, Apple has doubled the resolution of the displays, which are now 640 x 960 pixels (iPhone 4 and 4s), 1536 x 2048 pixels (iPad 3), and 640 x 1136 pixels (iPhone 5). To keep a good-looking user interface for both the old as well as the Retina resolution, Apple decided not to resize all graphics or make use of scalable image formats (such as SVG), but instead it now requires two sets of graphics for each device. When building an app for iOS, you have to provide the normal-sized and double-sized images for each graphic. This is where the strongest Adobe Fireworks feature comes in.
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